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The present document states the minimum requirements for equipment to be used for generation, transmission and 
reception of Class A Digital Selective Calling (DSC) for use on board ships. 
The present document covers the operator interfaces and operating system for Class A DSC equipment. 
DSC is intended to be used in the Medium Frequency (MF), High Frequency (HF) and Very High Frequency (VHF) 
bands of the Maritime Mobile Service (MMS), for both distress, safety and general communications. 
The present document covers the requirements to be fulfilled by equipment that is either integrated with a transmitter 
and/or a receiver or equipment that is a stand-alone DSC terminal and has the following class of DSC: 
• Class A: includes all the facilities defined in Annex 1 of Recommendation ITU-R M.493-16 [3] and complies 
with the IMO Global Maritime Distress and Safety System (GMDSS) carriage requirements for MF/HF 
installations and/or VHF installations. 
These requirements include the relevant provisions of the ITU Radio Regulations [2] and Recommendation 
ITU-R M.493-16 [3], the International Convention for the Safety Of Life At Sea (SOLAS) [1], and the relevant 
resolutions of the International Maritime Organization (IMO) [4].

The present document states the minimum requirements for equipment to be used for generation, transmission and 
reception of Class D Digital Selective Calling (DSC) for shipborne fixed installations. 
The present document covers the operator interfaces and operating system for Class D DSC equipment. 
Class D DSC is intended be used in the Very High Frequency (VHF) band of the Maritime Mobile Service (MMS), for 
distress, urgency and safety communication and general communications using telephony for subsequent 
communications. 
The present document covers the requirements to be fulfilled by equipment that is either integrated with a transmitter 
and/or a receiver or equipment that is a stand-alone DSC terminal. 
These requirements include the relevant provisions and the guidelines of the IMO as detailed in IMO Circular 
MSC.1/Circ.803 Rev.1 [i.1] for non-SOLAS vessels participating in the GMDSS as well as Commission Decision of 
12 August 2013 (2013/638/EU) [i.5].

The present document states the minimum requirements for general communication for shipborne fixed installations using 
DSC - class E. 
The present document covers the operator interfaces and operating system for Class E DSC equipment. 
Class E DSC is intended to be used in the Medium Frequency (MF) and/or High Frequency (HF) bands of the Maritime 
Mobile Service (MMS), for distress, urgency and safety communication and general communications and uses 
telephony for subsequent communications. 
The present document covers the requirements to be fulfilled by equipment that is either integrated with a transmitter 
and/or a receiver or equipment that is a stand-alone DSC terminal. 
These requirements include the relevant provisions and the guidelines of the IMO as detailed in IMO Circular 
MSC.1/Circ.803/Rev.1 [i.1] for non-SOLAS vessels participating in the GMDSS as well as Commission Decision of 
12 August 2013 (2013/638/EU) [i.3].

The present document states the minimum requirements for general communication for handheld VHF radios using the 
handheld class H DSC for shipborne use. 
Class H DSC may be used in the Very High Frequency (VHF) Maritime Mobile Service (MMS), for distress, urgency 
and safety communication and general communications using telephony for subsequent communications. 
The present document covers the requirements to be fulfilled by equipment that is integrated with a handheld 
transceiver. 
These requirements include the relevant provisions and the guidelines of the IMO as detailed in IMO MSC/Circ.803 [i.1] for 
non-SOLAS vessels participating in the GMDSS.

The present document states the minimum requirements for Man Overboard (MOB) devices using Digital Selective 
Calling (DSC) Class M, AMRD Group A as defined in Annex 1 of Recommendation ITU-R M.2135-1 [i.1]. The present 
document also defines the requirements for equipment that uses DSC alerting and signalling in the maritime mobile 
bands and particularly the GMDSS distress and safety channels. Such equipment is not intended to provide any 
subsequent communications or telephony facilities. 
The present document covers the channel access rules and technical requirements applicable to these devices. 

The present document specifies the minimum requirements for GMDSS radiocommunication system using Digital 
Selective Calling (DSC) Class A, with the capability to operate on a SOLAS bridge with the application of SOLAS 
regulation V/15 [i.4] and thus implementing the BAM concept defined by IMO in MSC.302(87) [8]. 

The present document states minimum requirements for GMDSS radiocommunication equipment using Digital Selective 
Calling (DSC) Class A [2], with the capability to fully operate handling of the automated procedures defined in part 2 of this 
multi-part deliverable, see ETSI EN 300 338-2 [2] from a remote position such as a central HMI. 
In addition other proprietary control interfaces may apply to support full remote control of other DSC equipment functions. 
Such proprietary control interfaces (whether based on proprietary IEC 61162-1 [3] sentences or other protocols) are not part 
of the present document, and may co-exist with the requirements in the present document.